Re-export Change from v1 & v2 root (#1158)

- Re-export Change from the v1 & v2 index.ts
- In v1, we can export from `cloud-functions.ts` since that module is exported from the root

Author: colerogers

src/cloud-functions.ts

@@ -39,6 +39,8 @@ import {
 } from './common/encoding';
 import { ManifestEndpoint, ManifestRequiredAPI } from './runtime/manifest';
 
+export { Change } from './common/change';
+
 /** @hidden */
 const WILDCARD_REGEX = new RegExp('{[^/{}]*}', 'g');
 

src/v2/index.ts

@@ -60,4 +60,6 @@ export {
   EventHandlerOptions,
 } from './options';
 
+export { Change } from '../common/change';
+
 export { CloudFunction, CloudEvent } from './core';